Hoisting attachment for ladders



Jan. 18, 1949. B 2,459,621

HOISTING ATTACHMENT FOR LADDERS Filed June so, 1945 IN VENT OR fhazzles'L. Cobb W I A TTORNE Y Patented Jan. 18, 1949 UNITED HOISTING ATTACHMENTFOR LADDERS Charles L; Cobb, Los Angeles, Calif.

Application June 30, 1945, Serial No. 602,528

4 Claims. (01. 248-2 My invention relates to hoisting attachments forladders by which materials used in constructing and repairing the roofsof buildings can be hoisted to the roof through the use of a ladder ofconventional construction.

It is a purpose of my invention'to provide a hoisting attachment forladders, which is characterized by its structural simplicity and lowcost of manufacture; its easy mode of attachment and detachment to andfrom a ladder; and its ability when attached, to secure itself againstaccidental detachment without the use and manipulation of screws, bolts,nuts, clamps, and the like.

I willdescribe only one form of hoisting attachment for laddersembodying my invention and will then point out the novel featuresthereof in claims.

In the accompanying drawings:

Fig. 1 is a view showing in vertical section one form of hoistingattachment embodying my invention in applied position to a ladder, andthe ladder moved away from the side of a building to illustrate how theattachment is used in the hoisting of a bucket to the roof of thebuilding.

Fig. 2 is a view showing the hoisting attachment in side elevation andapplied to a ladder.

Fig. 3 is a view similar to Fig. 1 showing the position of theattachment and the ladder when no material is being hoisted by theattachment.

Fig. 4 is an enlarged perspective view of the hoisting attachment.

Referring specifically to the drawings in which similar referencecharacters refer to similar parts in each of the views, my invention inthis embodiment comprises a frame designated generally at F which may bemade of a single length of steel tubing bent medially of its ends toform a pair of parallel spaced legs [5 of equal length, and an upperconnecting or bridge portion l6 preferably of bight form.

Welded or otherwise secured to the same side of the legs and arranged inpairs one beside the other, are brackets B for attaching the frame tothe rungs of a ladder. These brackets are identical in construction, andeach comprises two arms I! and I8 constructed from a single piece ofmetal and arranged at right angles to each other.

In each instance the arm I l at its free end edge is cupped to conformto the rounded contour of the leg l5, and welded to the leg at thispoint so that the arm is perpendicular to the leg, while the arm 18 isparallel to the leg. Such mode of fixing the bracket to the leg issupplemented by a metal web I9 which is shaped at its inner edge to havecontinuous contact with the outer sides of both arms n and"), as well asthe leg is, It is at this edge that the web is welded to the arms andleg, thereby reinforcing the bracket against bending, and providingadditional securing means for the arm ll. 1 v

The foregoing described construction of bracket B is for use withladders having rungs of square or rectangular form in cross section, butit will be understood that the brackets can be modified to render themapplicable to ladder rungs of circular cross section.

To provide means for swivelly suspending from the upper end l6 of theframe F, a conventional pulley P with its accompanying rope R, a crossmember 20 inthe form of a metal rod reinforced by a web 2|, is welded tothe legs l6 adjacent the frame end l6. From this member 20 the hook 22of a clevis 23 for the pulley P may be suspended to positionthe pulleybetween the legs I5, as illustrated.

My hoisting attachment is applied to the rungs 24 of a ladder bypositioning the frame above and at one side of the ladder so that thelegs I5 are between the side rails 25 of the ladder, while the bracketsB are above the two uppermost rungs. That is to say, the brackets of theupper pair are above the uppermost rung while the brackets of the lowerpair are just above the next rung below. With the attachment sopositioned it will be clear that by lowering the frame F the brackets Bare caused to embrace the two uppermost ladder rungs, and to therebysecurely hold the frame on the ladder against both downward movement andlateral movement. The pulley P may now be applied to the cross member 20so that the pulley is suspended from the frame at a point above theuppermost ladder rung with the rope R extended to opposite sides of theladder, as illustrated.

In use of the attachment, any roofing material may be attached to oneend of the rope such, for example, as the bucket K (Fig. 1), while theother end of the rope extends to the ground for manipulation to hoistthe bucket K upwardly to the top of the building indicated at D inFig. 1. In order that such hoisting of material may be "effected it isnecessary for the roofer on the top of the building to move the ladderand the attachment away from the parapet D of the building, in themanner illustrated in Fig. 1. By such positioning of the attachment andthe ladder the bucket K can be hoisted between the side of the buildingand the ladder and up to a point within reach of the roofer on theparapet.

When the attachment is not in use it does interfere with the normal useof the ladder as it can rest against the parapet, as illustrated in Fig.3, to be used for reaching and leaving the building roof. To detach theattachment from the ladder it is only necessary to elevate the frame Funtil the brackets B disengage the rungs, and this can be done uponmoving the ladder to the position shown in Fig. 1.

Although I have herein shown and described only one-form oflhoistingattachment and ladder embodying; my l lnventicn; it is to b understoodthat various changes and modifications may be made therein withoutdeparting from the spirit and scope of the of my invention and thespirit appended claims.

I claim:

1. A hoisting attachment for naaei-s, includ-' ing: a frame of invertedu-rerm';z'-a pluralityof f rung-engaging brackets fixed to the parallelporm-parallelism, a handle at one end of said legs, and a cross memberbetween said legs and spaced tions of said frame for supportingsaidfra'me on the upper end of a ladder when it is substantial- 13*vertical; and withits" bight portion above said upper-end; and meansonthe bi'ght portio'n of said frame" affording means "-fro'rn which apulley may be suspended between said parallel portions.

2 A hoisting attachment for ladders-includingi-a'irame of-inverted-U-'form; and'bra'ckets fixed-to the-parallel portions ofsaid "frame;and so const'ructed and arrangedas to 'embrace 'at least two rungs of aias-demo support said frame in a plane parallel -to and extendedupwardly from the upper end of a ladderwlien the latter is substantiallyvertical; 39A hoisting attachment for ladders; includin gz-a pair oflegsfixedly'cennected to each other at one of their ends and otherwisespaced-apart substantiall in parallelisma distance to' be recross Inrromisaidcandle; and providing means from which a pulley can besuspended between the "legs; and brackets on said legs for attachingsaid irame:tov'a ladder so that said handle and said 7 4 ember arepositioned beyond one end of theladder. 7

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